package lq;

import java.util.Scanner;

public class lq2003 {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        double m;
        while (in.hasNext()){
            m=in.nextDouble();
            if (m<0){
                m=-m;
            }
            System.out.printf("%.2f",m);
            System.out.println();
        }
    }
}
